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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80696f71b74985fe4fc46214e1da45049afc1bcb3cb7a5a9be027beef55dd17b' 
  AND token = '/63Sq7QTg4FiyXBq0jaRTUA3SRdOkI0R6AAAY7Jzqjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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