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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd6696fb9eaf07330841b62253cf4306f23fc90d683d9c7f4fb08bca7588255' 
  AND token = 'mrnOwfujBS/BtdMLD1Di7qyuHFbGMGJbyGyAtngQoPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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