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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42ed66c481ae05b22b9a12ed73ec38e0fbe1dc840fae954633e4221bb429802' 
  AND token = 'q10dxgBj8qI9R+8dtzeJFlLKuVJqB3e4EUUCNnUJTlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}