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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27959aceced68529bba02c6c7d5009282c7827789927fa38c46fc90be6de7e4' 
  AND token = 'zVN9f5AEg5vEYaUw7yGLWK1amfLWsHJ3BCGSuoAoQiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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