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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af90ad0f68a05bebe0d1db8438bc958ad98b9a88f0bf84af7ea0eb567cc5d03' 
  AND token = 'GjeqfRJAbSZ9jzeoouqn89zKEggMU4ybEp6RQ13fsWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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