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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdadcd2d9ceac52ad552205b7bea753bd4591f1172c797dfd5772a69864d8744' 
  AND token = 'wNV+aBpEvKd7Qa6xfjfSCvMqKz62Pdm35KBOBnEQszY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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