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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae48da869e5e268373d2b116c2c0c3cf3f063af0d6f1e67d3056fee7c248728e' 
  AND token = 'BKDeXlSDMmWhShG4BjPt7jnpbcao9TqX8dx0HoJgqm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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