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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d85b6d66582f0a64b4d521e5ef9f3240672648dfe51c84248b0c419f548a27' 
  AND token = 'a53GfonlUc36VaQigz2kdnvq29QqXe1lDKPKLezg7bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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