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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e869c421cd3494ed1a6a14d09bc4c418a60be8ed77e8408774ca3fc10dafec36' 
  AND token = 'J+1d7S9VST2Yf/uAbmW6KptwHOANMJcfb7Zk0S0Injs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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