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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb828af580650c31917a7ae489e3f7d465175affb54573258b09ecdcb72623f' 
  AND token = 'gNJkh+mTSwF41fixfrSwh4AVLE+65N0d4xlLvEP4Fyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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