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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26fa4e269c5452e0bf9704bd9c0feb6d2773bc5fd2cdfc8f656c9b235b60f6e' 
  AND token = 'xfO0DNLgzZtW2C9vCTbIVlSa+Psc0BWa8dEfR5ldUYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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