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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a215bca8ccec89491bd5a3a52254f9a118eb7c04118c1c5c8f4551de6953207' 
  AND token = '9W8lSZPIxOxga+oey/E1kzvZRQ/MlOvbpS80TqLm66k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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