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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1b07aa79cdffc20fe84c9209aef0bfa6e1dbcaa41376096b6d725e7d534ea6' 
  AND token = 'wPxE03xTPcmAbn4wGecMG7Q6ih9kBtxIbytgXEdXP/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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