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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e2fccd88dae28009fb40aa703d3f27e4fb0134bc63be3cb7c1aa84db6ef186' 
  AND token = 'PUlxY6Dp7P6Yxh1qhessBqF1w3oStnPMs06JA2SGSY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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