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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b3cab10310e21688c98e2eef757efa0aab006ec0e30946005f556662985d8d' 
  AND token = '9UEX1D8HoxbfNUq7J2VlPUMg94BBHa0E8EFy5wBZ6uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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