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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8933ec4fd5f9dbffec73826c2cbaa0740276d7742667ba6578c4c8519bc20f2a' 
  AND token = '1hvq2odHPUyeAAw0haVB5QKpyNed0/ERRlMgT0omAzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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