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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbad7631c0d3d1655a8b011cf79e3bab44d1bc6b609af8b03bd5906a3c23d5ae' 
  AND token = '2EQenoIompgeosRdSksuZD6tOvUUg1JAIg5fFzr81Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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