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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f1511b113c72cd625acd6a97b28421cbcaf69ed68af8e451f3bcbd099f3604' 
  AND token = 'i/d8EIWJbyW8bCEsr3ZOwiv+rMzlBc2n+fnNdeHUE5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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