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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aebbc7567d9ad36225d88cf04af37cb066f6a9e6def4385fb3e70d9aa01fb88' 
  AND token = 'sfCCEJ4XDjA7JYHrFv1qEcj8V0y0lKOgmm84FlBlyUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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