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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966d34b2aaa0bb6ff2f7077faea85b462e413b63208a4104fff4e8cbb6fa01d8' 
  AND token = '3S1mvkwTtcds4LSOqLj9bELrAW9dIuTVe/aKCay94q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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