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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09b9e1e2902be82e1364c94db6b297f1cfda11b419b7c534cffa342029af3f2' 
  AND token = 'wf51nxlUsFNUKBVWjKyFvZSodIfN0c6rBrAvGc2w3LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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