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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604855ca2b622bf04776a9c30003dce7613d7962fd31587b767fa2980f9a4603' 
  AND token = 'XW9SqQjqnKjplM2uMVUnPV2KL1tRjJATm0h1ZetyNsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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