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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5fe4820e3236d4f1eb4df04f0cb80741ccaffec03924aa6b975a9c8f53d6fc' 
  AND token = 'WEgTAjYg4LqkDRigVIaZN634tqMDyEt0K5PQhkpHNxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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