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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c519251d36ad341a0057d90313655febdfb7b88bdc01b67733e62282b0e683c' 
  AND token = 'zCRkiCFJTDfTXw/uhosbNQ5856PUh7CbGS6PNojNAng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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