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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311fb72c69c4e9b9114169094740d914c0e6337c9d0264aa774a4a87934a8a3c' 
  AND token = 'KvGAEAzU6GXYOWb1ZkoUr/1N0XzO2vA2f3r5n7j/N4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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