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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b4be8d690070db6ebe63ded79bc779844df70cb1f9566b6386761e10166fc3' 
  AND token = 'pBXCiHz8+3gs8659Opc8qt7N2w9DoDz/v7iKdIGCgWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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