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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810626e4b0119d82d0df2c5baadfeb2b353a1e9ed912d4249152d3a01d1c023b' 
  AND token = '9nCOmtVV8kIttk28JzZI1FofhL9AHwN61GTmJYpi3IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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