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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56556900cb41a0482cf50f5063bd7d12838039995c450a7f005b9ee7ae4a1ce' 
  AND token = 'Cuuh1QMDKZMPC3a8T+6DNxbPqE9LrpyJ+er0NKNHr44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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