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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9755a6302dd2e68ef2773c1b72a883ced0ddae9f2d4bae1b9472ee3afcd7b812' 
  AND token = 'u+8Xxp+LHO1AZ1iTlv3ayliq4A9GJHZjWeRt90R1CyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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