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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02071d5550ec5fef27ec8b775393bd6ef21a68f6c7e6ca527fcba426d1103f2' 
  AND token = 'q9nnpgdnIT7998YDlkASQ0y78HxaT+uEoz9IE07V4kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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