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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c232a15adec48bc7f850350c718510d13cee9ed7b8d1b0e3d2928ebd45be13f3' 
  AND token = 'f7ZuU4tIQxSiQiAS/8posMOb/na4Ciy3J873pE2pNY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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