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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febbfeb7acdd003acdeb8a80eda2b2f6f85f4d13d1cea1505c78c0b40bd556a4' 
  AND token = 'U2ae6bUhIJssOH8Dm2u7iH2BbHaAfWeUUfSE26jHt7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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