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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770af3f5151b5287b4b3271da2945e5896a99bd7c66f4801159bf76673c7c454' 
  AND token = 'q0bdhWc/ro4g4YScfOxQlV9AN5fHCLSU7yZRXZbtOB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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