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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f534a3271913ec1e60898b63a03d285e79aede6a59f38b4bd3488d618f159cd' 
  AND token = 'MbVreBjNbe4aW2oXUDo5yQvEPLE1pvMBxLmBVkI2Oi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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