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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c6078bf08ff59b2dfd89aae82ae9cafa42ae880f7791b2c5acea06790858ed' 
  AND token = '19kkLtjo+/H0WL5ZrWz7hYjWR4evD5LjN7IkR488N4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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