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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b0e36fddcc420bb40a604702a53a34da098226f86519043590b9527aa5416d' 
  AND token = '0cRpO2wS9Z49g69tEQqH40yC4z5/7UJJYELi8Rd273I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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