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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41dfd921fddf65f75405c6722c6a5eded3675b14ce73e68ec56f3ff3eb4df14a' 
  AND token = 'VfJmcRlyQ+x2raDPv42qvLLzUb1JmpcoAWzzOsMFRPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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