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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c28e208c03e89e9882772f115c4c4fb7ce98cfbbcce0677f175c96848ce2f31' 
  AND token = 'TPbu/s0lfoS3T89nNXZxulVeSNZm6B9zWeq9qn4E9e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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