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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd4f2acfbb188c9d536db66d48784ab7c1ac8e75d327a110633ca9b3adc9742' 
  AND token = '1Xii6ZQJC8Bb9mihbkOc15Qtq9OC2evl1XcIIRbLP+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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