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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0d880845ef22f23d6f1f8cb6e2d6e77e08ea7a71064295bc5fa13eb68d6b81' 
  AND token = '8wcyrKGfBgWmgxIOG2vRCT2U4OD1ttRGtTVzW9cCIP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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