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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c2073f6c72ba50164853b1e5f6d20c4c7ad52f008e84da32b50d70cbfa081b' 
  AND token = 'FmhtMmoSG8iYL9ql6Yj94dYyjn98ocg/Hw5/RKewgDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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