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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a0df5528725c34263b1f0e9ce6286cb6f05defe0d6d58cad278336c5417a9f' 
  AND token = 'NJnWfvCgtqskVx+F2TOEi29/Ps68n97BoY8/gGc3zzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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