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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe8f146bd19bb20a887415289b9b9b6435c184f3ca3198569439d805bec93b1' 
  AND token = '/ENJuASBA3kY9i9hMvWjt05lr1QlLl1bqll5Gu85Xxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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