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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a645b24d1bdbc6e56d63e4a42d35267c4b123c2e41df077327cca575e0d188' 
  AND token = 'P/5uf8463ywRkzevDbgzXPPoB31ZGybHX2wQowdT1W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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