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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95df7a01caf1c048d3fd943a921b6de913b04592d41f010994976d9616743f0e' 
  AND token = 'i+4DGWz2CP1MY/Cb2lNvPYBe6qMdnmKY17sP/oIX8UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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