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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52155279eab34d3f253e16e0723c4e4b42dc4bd63d26c4a9290860e68fc4d97' 
  AND token = 'ufI0NgDWnRBEVc9WklJoef1jeVXqAWULJs3ydtQuHyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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