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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b97b538f9533896649f4ee6168bc26f153899c0ae02f3218017f5453ea0bf8' 
  AND token = 'wUzIikADLaUXsICXg9Eds2GR17/+0d1Ndemn9GTBK9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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