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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66bbd57971563cceda2cc2a3c7162cf27c97b67b4c1f858af0e8b167aafed79' 
  AND token = 'qO332RW1K0BvpzkDHb77Gx6PDWzlhajV0As0EnpG6nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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