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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07258419d1ff056466b1ce40e4fa918f78b66ab48e184fe0d82feaaf3ae2d3d4' 
  AND token = '9SAT+l405lAt7NTSzait6Ok+qyFjE7SlgdkNE5Qxtvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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