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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f70abac0b6910297232d008f745b5b446409ae8abb1199820c87770ea93df8b' 
  AND token = 'zrz0LQfVrV/Rv6BZ1syaF5FiUoGI2y4Fa8YkEnW/ig4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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