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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30a89649b41067ccf7fd7345af38fe87ce8028f868b335d6ecb5227ccb7e8fb' 
  AND token = 'kspRdfzEOC7dzJj6XaZ4cCQ1KNoNnFqExmfqqYY1ZX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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