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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ae7d8ee13ceffcf3615a22d2f56f4ea96e0df242f05193a9c4e21f3b2f30da' 
  AND token = '8gbhAhEelEKSdfd3dMlW53V/zOCora2gq6AV4oUNfX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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