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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6c01556a59b73c90573d5744357b59c2c7d19fdb35f6157ec5eed2f4717f99' 
  AND token = 'y3MjmI+mq/amssjZmnoB2lLc4suqQ9tBoBV0RUsobpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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