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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5d93cced3eea17302df5eb2c3e780eb6715217371cb0c31d376e44326a6e07' 
  AND token = 'XGgOLB5phMxT6l2gzsJVmfMbiMpeuLcwY6at7EosCe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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