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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23ebbf44be66137b23e24213e933e3d4d50689098bfa8d78590a93d889450ae' 
  AND token = 'mOdrRBtbd89ivXci/V4o8L8V07HAuFzejO9ccg7N2dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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