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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0d09be22b399501a36da91c49b7b00fbdac76a050682d30d76a692b8fae18c' 
  AND token = 'Dzz4dIShHcSyg7Dcx5Eo7b/wuSc9OiQGrTnbdJwsHy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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