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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e93ff1d456ed75f52b575edcb45bb7a4b37f92d6a63c1afd253866c1b6f5462' 
  AND token = '0nuRTdie623TrJmZr/kFSZNlmVme5jNRAHhWwwY6y1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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