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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aeb791b8ca370ec362bd85b45cbd912f65cdbce7252d934003c3e8d5a3932ef' 
  AND token = 'bXrPjIA/xES2K8mnEh2YWErixwDVZK5TvlD5mafFoQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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