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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86198dd97285bc9edc46cc1763ce51e854dc0dd2f330c3b97b3d179ebb3b828' 
  AND token = '3wTZUeRgj31VhoXNsagP6AVpg2AhyX2L4QVp3Wo7O0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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