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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363caa4f99343f3c9d087c2ecf63d7ab8252f4b06f856940820e5ba1fe9c23b8' 
  AND token = 'TGanfyaRBodwuMbxd8XfYD8TS6peKF+T03gjklG+Pro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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