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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd131952b026d11f3bca7aa007cfd2f0c505dfac191a3bdd389909ac7debd6256' 
  AND token = '3FOI0cr0fjFV5Zl0s6zMa2XRf4QSwd+aqOByd8YAhVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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