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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e8e2a23237eb149cbaebbfe92b4b9969b99ff8425d17d0a6bbbaebfdcfdd931' 
  AND token = 'aTUPwhYp4RQ+yhO426q9vpyYMMfCrRPGdcKPlYmV8es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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