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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61b29fa3684c9a274373fb08e85b542ef7e4c3a2138697676a1b04a1f8acfe8' 
  AND token = '1qHEVzHc1rFI0icuBSNFYQxMwoooQ6z9ZtuGeO0+zbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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