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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee98dada64a34d1e26ab49b5620c71a1335c059c029010501b87e2a0854ee675' 
  AND token = 'PpfnF35JVmMfnLKj/1zV2jtGToc+o+XhUyVdl/MycBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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