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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ecf709ff47af134f658ffdc07c87a72a907f9d8f4a4340e6b526e80823e3982' 
  AND token = 'M28Figzx0JVFBEwU1X7ZbU4jKqdvb8cWslE09U6SegM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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