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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d1a850b2163ee44656aa09fac9c9cf56cd7e90681501d082ff926df77fda3c' 
  AND token = 'HpN4017v+WINgN7EfYa8p91qSZa0u6LaiBBYeYAydSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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