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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7debf1f6a6ca8d72229495042a6308c9f905e1fbd016cb2e1257ba750c342e21' 
  AND token = 'pJ2Akx3aMVPaKi2OQhkd353kdiajvu8PiTkDQN8+51A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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