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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1079263c6b2b33f65d34ef7a4bce4bc8c4b19392839c02eaf96f5e910dde23' 
  AND token = 'MXCx6W1YzlO24PypmCiDCffWHQbKIeUtcLBwN5WK9w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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