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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babc18c26c487def99f998fb945f73f7a4a30ad49bad807a27b41d2c5ef44cd4' 
  AND token = 'sObDx/5Vbv3EC0Beh/piTyncg5EycaBnKdEMZwRH4L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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