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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de2feae9f449b7f146194d651e8d8f5b7b3a74b7e346dd24ed030aea08a8cf7' 
  AND token = 'm3GByxi/A1q41yxM4rKM7nFVCoeJX9zdftcTrj28zDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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