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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a015c691bfe15a7d74195643bdfc1d16dade3b1af0d38350252d03a822b799' 
  AND token = 'D988PDJaS63tZqr0Kv0trzGcSnJOaR+7KpQzC0ekiQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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