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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab627d23b4cb0e5ff73495e7ef56cfb62bcc3357f805a5adffbde69635a84f74' 
  AND token = 'zYt/Cl66UJZgoWJPX7oR9eU3rVNdNoYaw14FCk4mQ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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